5000 targets

pure touch:
 2m14.161s

Jam
Jam touch build: 4m8.313s
Jam no build: 0m3.082s
clean: 0m6.935s

SCons:
touch: 13m33.841s
no:  0m19.399s
clean: 0m20.644s

GNU make:
touch
real    18m17.059s
user    3m17.891s
sys     16m51.985s
no:  0m27.843s

dmake:
touch 16m40.069s
no-change: 0m24.882s


NUM_LEVELS = 5
NUM_SOURCES = 3000
15k Source files.

OO.o 23k cxx and hxx files
810095 lines of dpcc data

Test: 15k source lines
567000 lines in Makefile.dep
